Bathroom Plastic Stall; Adding Additional Plastic ?

Hello:
Would like to get some advice from all of you so I can learn a little on this before contacting a Contractor.
Have a 25 yr old house in which the upstairs shower stall is one of those molded plastic types, where most of it goes in as a single unit.
It's about 6 feet high, which leaves the remainder to the ceiling, and the ceiling itself, just painted drywall. It has begun to flake.
I am thinking of asking a contractor to come in and discuss the possibility of doing the rest of the walls and the ceiling with additional plastic.
a. Is this feasible ?
b. After scraping the flakes off, need there be any surface treatment or priming (e.g. with that Zssner product) beforehand ? Can the primer, if needed, go directly over the existing paint ? (I'm assuming the drywall underneath the flakes is still in "reasonably" good shape)
c. If not in good shape, what do I do ?
d. As always, there's always a complication. The ceiling over the stall is curved. Not a plane surface that slopes, an actual curve to the outside walls. Not drastic, but a pretty fair amount of curvature. If "plastic'd" over, can they handle a curved surface ?
e. How should the joints be sealed ? RTV Silicone ?
Any other options, thoughts on what else to ask the contractors, etc., would be much appreciated.
Thanks, Bob
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Go to builder's supply stores and review the vinyl-surface wallboard designed for bathrooms. It is designed to look like ceramic tiles and is flexible enough to fasten to a bowed wall.
--
Don Phillipson
Carlsbad Springs
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